Infiniti QX56 2009-2011 Oxygen Sensor 226A0-EN21A Original Specification

Infiniti QX56 2009-2011 (5.6L V8) and Nissan Patrol Y62 2010-2011 platform can directly replace with this oxygen sensor. Monitors exhaust oxygen content and feeds ECU to adjust air-fuel ratio to meet emission standards. OEM number 226A0-EN21A; during replacement also check harness plugs for aging and poor contact. Replacement difficulty moderate; lift the vehicle and remove exhaust heat shield; use a dedicated socket wrench. This sensor is a pre-cat oxygen sensor; if the vehicle has rough idle or fault codes P0031/P0051, prioritize checking this part.